tailieunhanh - Báo cáo hóa học: " Catalytic ozone oxidation of benzene at low temperature over MnOx/Al-SBA-16 catalyst"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Catalytic ozone oxidation of benzene at low temperature over MnOx/Al-SBA-16 catalyst | Park et al. Nanoscale Research Letters 2012 7 14 http content 7 1 14 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Catalytic ozone oxidation of benzene at low temperature over MnOx Al-SBA-16 catalyst Jong Hwa Park1 Ji Man Kim2 Mingshi Jin2 Jong-Ki Jeon3 Seung-Soo Kim4 Sung Hoon Park5 Sang Chai Kim6 and Young-Kwon Park1 7 Abstract The low-temperature catalytic ozone oxidation of benzene was investigated. In this study Al-SBA-16 Si Al 20 that has a three-dimensional cubic Im3m structure and a high specific surface area was used for catalytic ozone oxidation for the first time. Two different Mn precursors . Mn acetate and Mn nitrate were used to synthesize Mn-impregnated Al-SBA-16 catalysts. The characteristics of these two catalysts were investigated by instrumental analyses using the Brunauer-Emmett-Teller method X-ray diffraction X-ray photoelectron spectroscopy and temperature-programmed reduction. A higher catalytic activity was exhibited when Mn acetate was used as the Mn precursor which is attributed to high Mn dispersion and a high degree of reduction of Mn oxides formed by Mn acetate than those formed by Mn nitrate. Keywords Al-SBA-16 Mn precursors benzene ozone catalytic oxidation Introduction Hazardous air pollutants HAPs are airborne species that are known to or are anticipated to cause adverse effects on human health and environment. HAPs are characterized by their toxicity carcinogenicity bioaccumulation persistence and dispersion. Most HAPs however are not regulated managed producing secondary pollutants and odor 1 . Benzene a representative HAP is a well-known carcinogen. Long-term exposure to benzene can cause blood dyscrasias such as a decrease in erythrocytes aplastic anemia and leukemia 2 . Therefore in recent years considerable attention has been paid to the removal of benzene and other HAPs. Ozone has been widely used for pollution treatment in the semiconductor industry water treatment .