Search results for: Qixiang Xu

Items from 1 to 10 out of 10 results

article

Computational fluid dynamics modeling of biomass catalytic fast pyrolysis in bubbling fluidized reactor: Effects of catalyst parameters on process performance

Yajun Qiu, Qixiang Xu, Shusheng Pang, Xiaoyuechuan Ma

In this study, a computational fluid dynamics mathematical model has been developed for catalytic fast pyrolysis (CFP) of biomass based on multiphase flow, transfer process, and biomass pyrolysis reactions in a bubbling fluidized bed reactor. The multiphase fluid flow, and the inter‐phase momentum and energy transfer processes are modeled with Eulerian multiphase formulas, representing the flows of...

article

Lubrication study of representative fluid foods between mimicked oral surfaces

Wenhu Xu, Qixiang Xu, Min Zhong

Journal of Texture Studies > 53 > 1 > 96 - 107

The lubricities of glycerol solutions with different viscosities were investigated at various frictional pairs, speeds, and loads to explore the lubrication regulations of diverse foods in mouths of different people. The friction pairs were characterized in terms of mechanical properties, surface morphology, and hydrophobicity. The results showed that the partial or complete Stribeck curves occurred...

article

Drinking tastes of Chinese rice wine under different heating temperatures analyzed by gas chromatography–mass spectrometry and tribology tests

Wenhu Xu, Jianzhong Jiang, Qixiang Xu, Min Zhong

Journal of Texture Studies > 52 > 1 > 124 - 136

Drinking tastes and lubrication properties of Chinese rice wine (CRW) under different heating temperatures were studied by tribology tests, gas chromatography–mass spectrometry (GC–MS) and sensory evaluations. CRW's drinking tastes were evaluated by taste panelists. Flavor compounds were detected by GC–MS. Lubrication properties of CRW were measured by tribometer. Drinking tastes changed under different...

article

Effects of heat treatment on the structure and photocatalytic activity of polymer carbon nitride

Qingbo Yu, Qixiang Xu, Huiqin Li, Kuan Yang, more

Journal of Materials Science > 2019 > 54 > 23 > 14599- 14608

Heat treatment technology is usually used for the processing of metal materials. In this paper, polymer carbon nitride (g-C₃N₄) is secondarily calcined at 590 °C. A series of nitrogen-doped g-C₃N₄ are obtained by adjusting the holding time. The doping of nitrogen atoms changes the electronic structure of the catalyst and narrows the band gap. In addition, the escape of ammonia during the secondary...

article

Nitrogen self-doped high specific surface area graphite carbon nitride for photocatalytic degradating of methylene blue

Qixiang Xu, Guoqing Xu, Qingbo Yu, Kuan Yang, more

Journal of Nanoparticle Research > 2019 > 21 > 11 > 1-13

Self-doped graphite carbon nitride (g-C₃N₄) is a hot topic in the field of photocatalysis. The g-C₃N₄ with nitrogen self-doped and higher specific surface area was obtained via adjusting the temperature of secondary calcination for 550 ° C, 590 ° C, and 625 ° C, which will improve its photocatalytic properties. The sp² hybridized C is replaced by the nitrogen atom. It changes the electronic structure...

article

Layered BiOBr/Ti₃C₂ MXene composite with improved visible-light photocatalytic activity

Chao Liu, Qixiang Xu, Qinfang Zhang, Yisong Zhu, more

Journal of Materials Science > 2019 > 54 > 3 > 2458-2471

Layered BiOBr/Ti₃C₂ (BTC) composites were synthesized by first preparing Ti₃C₂ nanosheets through the liquid etching of Ti₃AlC₂ powder and then hybridizing with BiOBr via a facile reflux process. The morphology, crystal structure, light-harvesting capacity, chemical nature of atoms and visible-light photocatalytic degradation activity were systematically studied and discussed. It was found that the...

article

In situ construction of layered K₃Ti₅NbO₁₄/g-C₃N₄ composite for improving visible-light-driven photocatalytic performance

Chao Liu, Guilong Xu, Yisong Zhu, Qixiang Xu, more

Journal of Materials Science: Materials in Electronics > 2018 > 29 > 18 > 15859- 15868

A simple calcination approach was performed to synthesize layered K₃Ti₅NbO₁₄/g-C₃N₄ (TNCN) composites, in which g-C₃N₄ was formed both within the interlayers and on the surface of N-K₃Ti₅NbO₁₄. The photocatalytic activity of samples was evaluated by the visible-light photocatalytic degradation of rhodamine B (RhB). It was found that TNCN composite with a proper mass ratio of N-K₃Ti₅NbO₁₄ to g-C₃N₄...

article

Cogasification of blended coal‐biomass in an air/steam BFB gasifier: Experimental investigation and model validation

Qixiang Xu, Shusheng Pang, Tana Levi

AIChE Journal > 61 > 5 > 1639 - 1647

A series of cogasification experiments were performed at a 100 kW bubbling fluidized bed (BFB) gasifier to gasify the blended pellets made from two types of coals and woody biomass, with biomass‐to‐fuel mass ratios of 0–30%. In the cogasification, a mixture of air and steam was fed from the BFB gasifier bottom as gasification agent and the blended biomass‐coal pellets were fed into the bed layer....

article

Reaction kinetics and producer gas compositions of steam gasification of coal and biomass blend chars, part 1: Experimental investigation

Qixiang Xu, Shusheng Pang, Tana Levi

Chemical Engineering Science > 2011 > 66 > 10 > 2141-2148

Biomass and coal are important solid fuels for generation of hydrogen-rich syngas from steam gasification. In this work, experiments were performed in a bench-scale gasifier to investigate the effect of coal-to-biomass ratio and the reaction kinetics for gasification of chars of biomass, coal and coal–biomass blends. In the gasification of these chars, steam was used as the gasification agent, while...

article

Reaction kinetics and producer gas compositions of steam gasification of coal and biomass blend chars, part 2: Mathematical modelling and model validation

Qixiang Xu, Shusheng Pang, Tana Levi

Chemical Engineering Science > 2011 > 66 > 10 > 2232-2240

In gasification of biomass, coal and blended biomass and coal, there are two steps including an initial pyrolysis process followed by gasification of solid char. The latter process is a slow process and thus dominates the whole gasification. In our previous paper (Xu et al., in press), the differences between steam gasification of biomass chars and that of coal chars have experimentally been investigated...

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