Search results for: Haoquan Hu

Items from 1 to 20 out of 108 results

article

Enhanced CO₂/N₂ separation in hybrid composite membrane via dispersion of hollow defect‐engineered Zr‐MOF nanoparticles

Jiahui Yan, Yanwei Sun, Taotao Ji, Mingming Wu, more

High‐performance and durable membranes are being sought to enable energy‐efficient CO₂ capture. Although representing an appealing candidate for the above application, successful translation of distinct properties of MOF filler into hybrid composite membranes (HCMs) remains challenging. In this study, we synthesized uniform hollow defect‐engineered UiO‐66 nanoparticles as filler for enhancing the...

article

A shared aperture antenna with reconfigurable pattern by common and differential modes

Menglong Chen, Haoquan Hu, Shiwen Lei, Kai Sun, more

Microwave and Optical Technology Letters > 66 > 1 > n/a - n/a

In this letter, a compact pattern‐reconfigurable (PR) antenna for indoor communication is proposed, which can provide one conical, one broadside, and two tilted patterns. The proposed antenna comprises a shared radiation patch with two highly isolated ports and a reconfigurable feeding network. By activating each port independently, a dipole mode with broadside pattern and a monopole mode with conical...

article

An improved implementation of volumetric SBR for EM scattering of a large‐scale target coated with plasma

Yufeng Cai, Wei Yang, Weizhi Gao, Ziyuan He, more

Microwave and Optical Technology Letters > 66 > 1 > n/a - n/a

In this paper, the volumetric shooting and bouncing rays method is proposed to investigate the electromagnetic (EM) scattering of the large‐scale target coated with plasma, which takes into account the EM rays propagating inside the interior of the plasma and fully captures the dominant scattering characteristics. Furthermore, an efficient graphics processing unit‐based implementation procedure with...

article

A wideband monopolar patch antenna with a high system fidelity factor for IR‐UWB application

Chaogui Huang, Wei Yang, Bo Chen, Shiwen Lei, more

Microwave and Optical Technology Letters > 65 > 8 > 2285 - 2292

A compact, broadband microstrip patch antenna with stable monopole‐like radiation patterns is proposed for impulse‐radio ultrawideband (IR‐UWB) positioning systems. Such the antenna consists of a circular patch with eight conductive vias placed concentrically, resulting in the

{TM}_{01}

and

{TM}_{02}

modes. Moreover, a tapered feeding probe at its center is presented...

article

Modeling char surface area during coal pyrolysis: Validation of relationship between pore structure and polymer network

He Yang, Yahui Yang, Yiyang Yin, Yiming Wang, more

AIChE Journal > 68 > 8 > n/a - n/a

The relationship between pore structure and polymer network during coal pyrolysis was studied by analyzing the evolution of microcrystal, pore structure, and functional groups of char prepared from Naomaohu subbituminous coal by a drop‐tube furnace reactor at 600–1000°C. The char specific surface area changes little with aliphatic bridge cleaving at temperatures lower than 700°C; starts to increase...

article

Switchable rasorber with high‐order frequency selective surface for transmission bandwidth extension

Ruiming Li, Haoquan Hu, Jing Tian, Bixiao Jiang, more

Microwave and Optical Technology Letters > 63 > 6 > 1705 - 1711

Switchable rasorber operating between rasorbing and absorbing states can effectively improve its stealth performance within the passband. However, the existing switchable rasorbers utilize single‐order frequency selective surfaces (FSSs), limiting their transmission bandwidth. This work proposes a switchable rasorber with expanded passband utilizing high‐order FSS. First, the switching principle of...

article

Effect of hydrogen addition on formation of hydrogen and carbon from methane decomposition over Ni/Al₂O₃

Jiaofei Wang, Lijun Jin, Guangsuo Yu, Haoquan Hu

The Canadian Journal of Chemical Engineering > 98 > 2 > 536 - 543

The effects of hydrogen addition on the formation of hydrogen and carbon from methane decomposition over Ni/Al₂O₃ were studied. The results show that the added hydrogen in methane greatly affects the methane conversion, hydrogen output rate, and the properties of the carbon deposits on the surface of the Ni/Al₂O₃. The methane conversion and hydrogen output rate are significantly improved by the addition...

article

Modeling the influence of changes in aliphatic structure on char surface area during coal pyrolysis

He Yang, Thomas H. Fletcher, Yang Li, Lijun Jin, more

AIChE Journal > 66 > 2 > n/a - n/a

The influence of changes in aliphatic structure on char surface area during coal pyrolysis was modeled, and the effect was introduced to a previous char surface area model for lignite pyrolysis established based on the chemical percolation devolatilization (CPD) model. The modified model can predict not only the N₂ and CO₂ char surface area during rapid pyrolysis of three lignites but also the CO₂...

article

Steam catalytic cracking of coal tar over iron‐containing mixed metal oxides

Tingting Wang, Yang Li, Lijun Jin, Dechao Wang, more

The Canadian Journal of Chemical Engineering > 97 > 3 > 702 - 708

Steam catalytic cracking is deemed as a promising method for the catalytic cracking of coal tar. In this study, a serial of iron‐containing mixed metal oxides including ceria, zirconia, alumina, cobalt, nickel, and barium oxides were prepared for steam catalytic cracking of coal tar and characterized by N₂ adsorption‐desorption, X‐ray diffraction, H₂ temperature programmed reduction, and Raman spectroscopy,...

article

Effect of hydrogen additive on methane decomposition to hydrogen and carbon over activated carbon catalyst

Jiaofei Wang, Lijun Jin, Yang Li, Mingyi Wang, more

International Journal of Hydrogen Energy > 2018 > 43 > 37 > 17611- 17619

The effect of H₂ addition on CH₄ decomposition over activated carbon (AC) catalyst was investigated. The results show that the addition of H₂ to CH₄ changes both methane conversion over AC and the properties of carbon deposits produced from methane decomposition. The initial methane conversion declines from 6.6% to 3.3% with the increasing H₂ flowrate from 0 to 25 mL/min, while the methane conversion...

article

Methyl substitution effect in pyrolysis of coal-based model compound isomers

Gang Li, Lu Li, Lijun Jin, Zichao Tang, more

Fuel Processing Technology > 2018 > 178 > C > 371-378

The thermal decomposition of three methyl anisole isomers (o-, m-, and p-methyl anisole) were investigated to understand the influences of methyl substitution position on the benzene ring at low pressure (below 15 Pa) within temperature range from 473 to 1473 K. The pyrolytic phenomena were studied by using vacuum ultraviolet single-photon ionization time-of-flight mass spectrometry (SPI-TOFMS) to...

article

Ni/MgOAl2O3 catalyst derived from modified [Ni,Mg,Al]-LDH with NaOH for CO2 reforming of methane

Lijun Jin, Bingxue Ma, Shun Zhao, Xu He, more

International Journal of Hydrogen Energy > 2018 > 43 > 5 > 2689-2698

[Ni,Mg,Al]-layered double hydroxide (LDH) was modified with NaOH solution to prepare the LDH-derived Ni/MgOAl₂O₃ catalyst and characterized by X-ray diffraction, inductively coupled plasma optical emission spectrometer, scanning electron microscope, transmission electron microscopy, temperature programmed desorption of CO₂ or NH₃, N₂ adsorption, and thermogravimetry analysis, respectively. The resultant...

article

Partial oxidation of vacuum residue over Al and Zr-doped α-Fe2O3 catalysts

Dechao Wang, Lijun Jin, Yang Li, Haoquan Hu

Fuel > 2017 > 210 > C > 803-810

Partial oxidation presents a novel method to produce liquid fuels, such as gasoline, diesel and vacuum gas oil, from vacuum residue (VR). Al and Zr-doped α-Fe₂O₃ catalysts were prepared for partial oxidation of VR. The catalysts were characterized by N₂ adsorption/desorption, X-ray diffraction, H₂ temperature programmed reduction, Raman, and X-ray photoelectron spectroscopy. The results showed that...

article

Effect of hydrothermal treatment on structure and liquefaction behavior of Baiyinhua coal

Zhiwei Shi, Lijun Jin, Yang Zhou, Yang Li, more

Fuel Processing Technology > 2017 > 167 > C > 648-654

Baiyinhua (BYH) coal, a kind of lignite, was hydrothermally treated in an autoclave reactor at 200–350°C for 30min and the liquefaction behavior of the treated samples were investigated. To uncouple the complex behavior of the changes in structural characteristics and functional groups of treated samples, the structural change in BYH coal was investigated by thermogravimetry, Fourier transform infrared...

article

Isotope analysis for understanding the hydrogen transfer mechanism in direct liquefaction of Bulianta coal

Ben Niu, Lijun Jin, Yang Li, Zhiwei Shi, more

Fuel > 2017 > 203 > C > 82-89

Direct coal liquefaction (DCL) was investigated using a deuterium tracer method which makes it possible to determine which structural positions in the coal react with H₂ or hydrogen-donor solvents, i.e. hydrogen-transfer mechanism. D₂ and/or 1,2,3,4-d₄-tetralin (tetralin-d₄) were used in DCL of Bulianta coal at 7.0MPa (initial charge pressure) and 445°C for 0 or 60min in a tubing-bomb microreactor...

article

Co-production of hydrogen-rich gas and porous carbon by partial gasification of coal char

Jianbo Zhang, Guorong Zhang, Meng Qi, Haoquan Hu, more

Chemical Papers > 2018 > 72 > 2 > 273-287

An industrial coal char from coal pyrolysis was used for simultaneous preparation of hydrogen-rich gas and porous carbon by catalytic steam gasification. The effects of K₂CO₃ as a catalyst under varying steam flow rates, reaction temperatures, mass ratios of CC:K₂CO₃ and reaction times were investigated on hydrogen output and textural properties of the produced porous carbons. The suitability of CaO...

article

Hydrogen production by catalytic methane decomposition: Carbon materials as catalysts or catalyst supports

Jianbo Zhang, Xing Li, Huiyong Chen, Meng Qi, more

International Journal of Hydrogen Energy > 2017 > 42 > 31 > 19755- 19775

Hydrogen and carbon materials are two promising research topics in the field of environmentally benign energy and material science, respectively. Hydrogen production by methane decomposition can avoid the formation of CO_x during the fossil fuel life cycle, paving the route for the development of a low-carbon hydrogen economy. The development of state-of-the-art catalysts plays a crucial role in efficient...

article

Online analysis of initial volatile products of Shenhua coal and its macerals with pyrolysis vacuum ultraviolet photoionization mass spectrometry

Zhiwei Shi, Lijun Jin, Yang Zhou, Yang Li, more

Fuel Processing Technology > 2017 > 163 > C > 67-74

Initial volatile products from pyrolysis of Shenhua coal and its macerals were investigated by using online pyrolysis-vacuum ultraviolet photoionization mass spectrometry (Py-VUVPI-MS). The fragment-free spectra of initial volatile products were measured during the temperature-programmed pyrolysis of the samples, and the intensity profiles of the initial volatile products as the function of temperature...

article

Integrated process of coal pyrolysis with CO2 reforming of methane by spark discharge plasma

Lijun Jin, Yang Li, Yongqiang Feng, Haoquan Hu, more

Journal of Analytical and Applied Pyrolysis > 2017 > 126 > C > 194-200

An integrated process of coal pyrolysis with CO₂ reforming of methane by spark discharge plasma was developed to improve the tar yield of coal pyrolysis. The effects of the reactor configuration parameters and the integrated process conditions were investigated. It was found that the conversions of CH₄ and CO₂ and the selectivies of H₂ and CO increase with the discharge input power. The electrode...

article

Mechanism of hydrogen transfer and role of solvent during heating-up stage of direct coal liquefaction

Ben Niu, Lijun Jin, Yang Li, Zhiwei Shi, more

Fuel Processing Technology > 2017 > 160 > C > 130-135

In this paper, the liquefaction of a Bulianta coal, from China Shenhua Group, was carried out in a hydrogen donor solvent, tetralin, or a non-hydrogen donor solvent, 1-methylnaphthalene, with or without catalyst to clarify the mechanism of hydrogen transfer. And roles of solvent and a nano-size iron catalyst from Shenhua Group in the heating-up stage of DCL were also investigated by using mixed solvent...

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INFONA - science communication portal

Search results for: Haoquan Hu

Enhanced CO₂/N₂ separation in hybrid composite membrane via dispersion of hollow defect‐engineered Zr‐MOF nanoparticles

A shared aperture antenna with reconfigurable pattern by common and differential modes

An improved implementation of volumetric SBR for EM scattering of a large‐scale target coated with plasma

A wideband monopolar patch antenna with a high system fidelity factor for IR‐UWB application

Modeling char surface area during coal pyrolysis: Validation of relationship between pore structure and polymer network

Switchable rasorber with high‐order frequency selective surface for transmission bandwidth extension

Effect of hydrogen addition on formation of hydrogen and carbon from methane decomposition over Ni/Al₂O₃

Modeling the influence of changes in aliphatic structure on char surface area during coal pyrolysis

Steam catalytic cracking of coal tar over iron‐containing mixed metal oxides

Effect of hydrogen additive on methane decomposition to hydrogen and carbon over activated carbon catalyst

Methyl substitution effect in pyrolysis of coal-based model compound isomers

Ni/MgOAl2O3 catalyst derived from modified [Ni,Mg,Al]-LDH with NaOH for CO2 reforming of methane

Partial oxidation of vacuum residue over Al and Zr-doped α-Fe2O3 catalysts

Effect of hydrothermal treatment on structure and liquefaction behavior of Baiyinhua coal

Isotope analysis for understanding the hydrogen transfer mechanism in direct liquefaction of Bulianta coal

Co-production of hydrogen-rich gas and porous carbon by partial gasification of coal char

Hydrogen production by catalytic methane decomposition: Carbon materials as catalysts or catalyst supports

Online analysis of initial volatile products of Shenhua coal and its macerals with pyrolysis vacuum ultraviolet photoionization mass spectrometry

Integrated process of coal pyrolysis with CO2 reforming of methane by spark discharge plasma

Mechanism of hydrogen transfer and role of solvent during heating-up stage of direct coal liquefaction

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