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Synthesis of SAPO-34 using N-octyl-d-glucamine as additive for enhanced catalytic performance in CH3Br conversion to light olefins
Molecular Catalysis ( IF 4.6 ) Pub Date : 2017-08-18 , DOI: 10.1016/j.mcat.2017.08.003
Jun Xie , Na Li , Peng Wang , Lang Chen , Chak-Tong Au , Shuang-Feng Yin

SAPO-34 catalysts of different crystal sizes were directly synthesized using N-octyl-d-glucamine (NODG) as additive, and characterized by XRD, SEM, TG, ICP-AES, N2 adsorption-desorption and NH3-TPD techniques. The addition of NODG leads to decrease of crystal size and enrichment of surface acid sites. The as-synthesized zeolites show excellent catalytic activity towards the conversion of CH3Br to light olefins. The SAPO-34 catalyst with the largest amount of acid sites (2.085 mmol/g) shows the highest CH3Br conversion (89.6%), whereas that with smallest particle size shows the highest selectivity to light olefins (72.2%). We attribute the enhanced performance to the increase of acid sites and the reduction of crystal size.



中文翻译:

使用N-辛基-d-葡糖胺作为添加剂合成SAPO-34,以增强在CH 3 Br转化为轻质烯烃中的催化性能

不同晶体尺寸的SAPO-34催化剂使用直接合成的N-辛基- d -glucamine(NODG)作为添加剂,并用XRD,SEM,TG,ICP-AES,N 2吸附-解吸和NH 3 -TPD技术。NODG的加入导致晶体尺寸的减小和表面酸位的富集。刚合成的沸石显示出极好的催化活性,可将CH 3 Br转化为轻质烯烃。酸性部位数量最多(2.085 mmol / g)的SAPO-34催化剂显示最高的CH 3Br转化率(89.6%),而粒径最小的化合物对轻烯烃的选择性最高(72.2%)。我们将增强的性能归因于酸位点的增加和晶体尺寸的减小。

更新日期:2017-08-18
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