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A novel willow-based solid acid catalyst was successfully prepared through sulfonation of pencil refill. This solid acid catalyst bearing SO3H and COOH groups shows macroporous structure, which is more suitable for conversion of cellulose into glucose, resulting in 78.0 % conversion and 65.0 % glucose yield at 160 °C for 8 h reaction time. Its activity was comparable to other carbon sulfonated acid...
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