挥发性有机化合物的催化减排:在废催化剂回收的氧化铝负载金属氧化物上进行甲烷或乙烷的好氧燃烧

S. Tahir, H. Askari
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引用次数: 0

摘要

利用工业废催化剂的渗滤液过渡金属硝酸盐和硫酸盐水溶液制备了γ-Al2O3负载型Cu、Cu- zn和Cu- ni - fe - zn氧化物催化剂。在一个实验平台上,研究了这些催化剂在空气流(1000 ppmv)中,在20,000 h-1的空速下对甲烷或乙烷的燃烧活性。与Cu和Cu- zn氧化物催化剂相比,Cu- ni - fe - zn氧化物/γ-Al2O3催化剂在290 ~ 575℃范围内对甲烷的燃烧和275 ~ 525℃范围内对乙烷的燃烧表现出较强的催化活性。x射线粉末衍射图表明,除了在含cu的单金属催化剂上检测到少量单斜相CuO外,所有催化剂的金属氧化物在氧化铝表面高度分散或无定形。氧化锌在CuO催化剂中的共存抑制了氧化铜的活性,从而降低了甲烷或乙烷的转化率。目前的研究努力提供了概念证明,相对便宜的金属氧化物基非均相催化剂可以从废催化剂中回收,用于减少voc。因此,不当处理挥发性有机化合物或废催化剂对环境和健康的威胁可能会减轻。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Catalytic Abatement of VOCs: Aerobic Combustion of Methane or Ethane over Alumina-Supported Metal Oxides Recovered from Spent Catalysts
γ-Al2O3 supported Cu, Cu-Zn and Cu-Ni-Fe-Zn oxide catalysts were prepared using leachate transition metal nitrate and sulfate aqueous solutions from commercial spent catalysts. A bench-scale rig was used to investigate the combustion activity of these catalysts toward methane or ethane in the air stream (1000 ppmv) at a space velocity of 20,000 h-1. The Cu-Ni-Fe-Zn oxides/γ-Al2O3 catalyst proved to be the most active catalyst for the combustion of methane in the temperature range 290-575°C and of ethane in the lower temperature range of 275-525oC as compared to Cu and Cu-Zn oxide loaded catalysts. X-ray powder diffractograms indicated that the metal oxide species were highly dispersed or amorphous on the alumina surface in all the catalysts except for the detection of a minority phase of monoclinic CuO on the Cu-containing mono-metallic catalysts. The co-existence of ZnO in the CuO catalysts suppresses the activity of the copper oxide species and, therefore, the conversion of methane or ethane was reduced. The present research endeavor provides proof-of-concept that relatively inexpensive metal oxide-based heterogeneous catalysts for VOCs abatement can be recovered from spent catalysts. Hence, environmental and health threats of improper handling of VOCs or spent catalysts may be alleviated.
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