Cu改性ZSM-5分子筛催化尿素脱水制备单氰胺
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摘要
通过离子交换法制备了一系列的改性ZSM-5分子筛催化剂,用真空原位红外对分子筛催化剂进行了表征,绘制了分子筛的红外光谱图。通过红外光谱图使用谱带积分法计算了布朗斯台德酸(Brnsted酸)和路易斯酸(Lewis酸)的酸浓度,推导了ZSM-5分子筛催化尿素脱水的催化过程机理。使用改性后的ZSM-5分子筛催化剂催化尿素脱水的反应,结果表明,改性后ZSM-5分子筛催化剂的催化性能明显优于未改性的HZSM-5。
A series of modified-ZSM-5 molecular sieve catalysts are prepared by ion exchange method. The molecular sieve catalysts were characterized by vacuum in situ infrared,and a infrared spectra are drawn. The acid concentration of Brnsted acid and Lewis acid is calculated by infrared band spectroscopy using band integration method. And the catalytic mechanism of ZSM-5 molecular sieve catalyzed urea dehydration is deduced. The modified-ZSM-5 molecular sieve catalyst is used to catalyze the dehydration of urea,the results show that the catalytic performance of ZSM-5 zeolite catalyst after modification is better than that of unmodified HZSM-5.
A series of modified-ZSM-5 molecular sieve catalysts are prepared by ion exchange method. The molecular sieve catalysts were characterized by vacuum in situ infrared,and a infrared spectra are drawn. The acid concentration of Brnsted acid and Lewis acid is calculated by infrared band spectroscopy using band integration method. And the catalytic mechanism of ZSM-5 molecular sieve catalyzed urea dehydration is deduced. The modified-ZSM-5 molecular sieve catalyst is used to catalyze the dehydration of urea,the results show that the catalytic performance of ZSM-5 zeolite catalyst after modification is better than that of unmodified HZSM-5.
引文
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[3]Franklin V,Foreman R W.Process for the production of melamine from hydrogen cyanide by way of cyanamide:US,3177215[P].1965-04-06.
[4]王女馨.双氰胺生产工艺的改进[J].浙江化工,1989,20(1):55-58.WANG Nvxing.Improvement of dicyandiamide production process[J].Zhejiang Chemical Industry,1989,20(1):55-58.
[5]李忠波.尿素制备硫脲新工艺的研究[D].天津:天津大学,2005.
[6]杨树斌,徐林,丁克鸿,等.一种多菌灵的制备方法:CN,106565609A[P].2017-04-19.
[7]Shibafuchi H,Sasaki M,Nitta H.Process for producing cyanamide from calcium cyanamide:US,5017355[P].1991-05-21.
[8]鲁军.石灰氮的生产现状和发展前景[J].安徽化工,2001,39(3):6-7.
[9]张莹,张汉良.浅谈石灰氮及双氰胺[J].山西化工,1998(2):23-24.
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[11]Emeis C A.Determination of integrated molar extinction coefficients for infrared absorption bands of pyridine adsorbed on solid acid catalysts[J].Journal of Catalysis,1993,141(2):347-354.