Direct hydrogenation

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  • The two most important environmental hazards faced by humankind today are air pollution and global warming. Both have a direct link with our current overdependence on fossil fuels. Pollutants produced from combustion of hydrocarbons now cause even more health problems due to the urbanization of world population

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  • DMFC (Direct Methanol Fuel Cell) – pin nhiên liệu dùng methanol trực tiếp Dù công nghệ vẫn mới chỉ chập chững ở những bước ban đầu nhưng đã thể hiện được một số thành công trong những ứng dụng như điện thoại di động và máy tính xách tay (laptop), đem lại triển vọng đầy tiềm năng cho tương lai. DMFC tương tự như PEMFC ở chỗ chất điện phân là polymer và điện tích vận chuyển là ion hydrogen (proton)....

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  • This is a book about coal gasification and its related technologies. The relationship between these technologies is shown in Figure 0.1. The gasification process begins with a viable feedstock. In this book, we focus on one of those feedstocks that must go through the gasification process, coal.

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  • The creation of Trichet bonds will result in various advantages both in comparison to the present unstable situation and other proposed solutions. First, the long duration of Trichet bonds will eliminate the immediate crisis caused by short term expiration of significant amounts of debt which is looming over Greece, Ireland, Portugal, Spain and possibly other EU countries. Second, the guarantee of the principal with the zero-coupon ECB bond collateral increases the quality of the Trichet Bonds compared to existing sovereign debt.

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  • This could be fortuitous at modest scales because oxygen is relatively costly (Consonni and Larson 1994a). However, for the production of methanol from biomass, the use of air increases the volume of inert (N 2 ) gas that would have to be carried through all the downstream reactors. Therefore, the use of oxygen thus improves the economics of synthesis gas processing. Air-fired, directly heated gasifiers are considered not to be suitable before methanol production. This gasifier produces a CO 2 rich gas.

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  • The presence of chlorine in alternative fuels (e.g., sewage sludge, municipal solid waste or incineration ash, chlorinated biomass,) has both direct and indirect implications on cement kiln emissions and performance. Methods have been developed to properly manage chlorine and its potential implications – but it is important that these implications be recognized and managed. Trace levels of chlorine in feed materials can lead to the formation of acidic gases such as hydrogen chloride (HCl) and hydrogen fluoride (HF) (WBCSD 2002).

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  • The activity of the digestiveb-glycosidase fromSpodoptera frugiperda (Sfbgly50, pH optimum 6.2) depends on E399 (pKa¼4.9; catalytic nucleophile) and E187 (pKa¼7.5; catalytic proton donor). Homology modelling of the Sfbgly50 active site confirms that R97 and Y331 form hydrogen bonds with E399. Site-directed mutagenesis showed that the substitution of R97 bymethionine or lysine increased the E399 pKa by 0.6 or 0.8 units, respectively, shifting the pH optima of these mutants to 6.5.

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