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Zhang R.-R.,Key Laboratory for Green Chemical Technology of Ministry of Education | Li Y.-H.,Key Laboratory for Green Chemical Technology of Ministry of Education | Li Y.-H.,National Engineering Research Center for Distillation Technology
Xiandai Huagong/Modern Chemical Industry | Year: 2015

Cu-zeolites exhibit excellent SCR activity, N2 selectivity and hydrothermal stability in wide temperature window, and are considered as the most potential commercial catalysts in the field of diesel exhaust purifying field. Therefore, the NH3-SCR reaction performances are compared. The relationship between active species or their position and catalytic activity are summarized. The reaction mechanism of NH3-SCR over Cu-ZSM-5, Cu-SSZ-13 and Cu-SAPO-34 are reviewed. ©, 2015, China National Chemical Information Center. All right reserved. Source


Lu H.,Key Laboratory for Green Chemical Technology of Ministry of Education | Lu H.,Tianjin University | Ren M.,Key Laboratory for Green Chemical Technology of Ministry of Education | Ren M.,Tianjin University | And 4 more authors.
Chinese Journal of Chemical Engineering | Year: 2013

Supercritical carbon dioxide, with water-ethanol as co-solvent, was applied to pretreat corn stover to enhance its enzymatic hydrolysis. The efficiency of pretreatment was evaluated by the final reducing sugar yield obtained from the enzymatic hydrolysis of cellulose. Under the operation conditions of pretreatment pressure 15 MPa, temperature 180 C and time 1 h, the optimal sugar yield of 77.8c/o was obtained. Scanning electron microscopy (SEM) and chemical composition analysis were applied to the pretreated corn stover. The results showed that the surface morphology and microscopic structure of pretreated corn stover were greatly changed. After the pretreatment, the contents of hemicellulose and lignin were reduced obviously. Thus more cellulose was exposed, increasing the sugar yield. © 2013 Chemical Industry and Engineering Society of China (CIESC) and Chemical Industry Press (CIP). Source

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