Abstract The addition of gallium or zinc to ZSM-5 increases the aromatic selectivity and decreases the olefin selectivity for furan conversion. Both the benzene and naphthalenes selectivities increase with small amounts of gallium or zinc addition. At 5 wt% metal loading this effect is more pronounced with zinc promoted ZSM-5 having about 25% higher benzene selectivity than the gallium promoted ZSM-5. Additionally, the decarbonylation and methane formation reactions were both increased by adding zinc or gallium to the catalyst. As zinc or gallium loading is increased, the amount of Bronsted acid sites decrease, while the quantity of Lewis acid sites increase. This effect was more pronounced with zinc, as a result of its greater effectiveness to exchange with protons at the Bronsted acid sites. The aromatic yield appears to correlate with this increase in Lewis acidity. The addition of zinc to ZSM-5 also altered the reaction chemistry occurring during the hydrolysis of furan, lowering propylene and increasing methane yields as zinc loading increased.

中文翻译：

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呋喃在镓和锌上的转化促进了 ZSM-5：金属和酸性位点的影响

摘要 在ZSM-5 中加入镓或锌可提高芳烃选择性并降低呋喃转化的烯烃选择性。苯和萘的选择性随着少量镓或锌的加入而增加。在 5 wt% 的金属负载量下，锌促进的 ZSM-5 的苯选择性比镓促进的 ZSM-5 高约 25%，这种效果更明显。此外，通过将锌或镓添加到催化剂中，脱羰和甲烷形成反应都增加了。随着锌或镓载量的增加，布朗斯台德酸位点的数量减少，而路易斯酸位点的数量增加。由于锌与布朗斯台德酸位点的质子交换的效率更高，因此这种效果在锌中更为明显。芳烃产率似乎与路易斯酸度的这种增加相关。向 ZSM-5 中添加锌还改变了呋喃水解过程中发生的化学反应，随着锌负载量的增加，丙烯产量降低，甲烷产量增加。