Provided is a catalyst for preparing high-purity taurine, and the catalyst is N,N-disubstituted aminoethanesulfonic acid and has a structure represented by Formula I, in which R.sup.1 and R.sup.2 are each independently selected from alkyl, alkenyl, alkynyl, alkoxy, benzyl, sulfhydryl, thioether group, aryl, heteroaryl, amino, amide, imide, cyano, aldehyde group, carbonyl, carboxyl, sulfonic acid group, or ester group. Also provided is a method for preparing high-purity taurine, which adds the catalyst in an ammonolysis step for preparing taurine, thereby having effects of high yield, inhibition of impurity production and a reduced amount of ammonia used, etc. The catalyst has advantages of low cost, stable physical properties, and easy separation from the product. The preparation method is simple to operate with easily available raw materials and high yield, and can be employed for industrial production. Moreover, the purity of the prepared taurine can be up to 98% or higher. ##STR00001##

Provided is a catalyst for preparing high-purity taurine, and the catalyst is N,N-disubstituted aminoethanesulfonic acid and has a structure represented by Formula I, in which R.sup.1 and R.sup.2 are each independently selected from alkyl, alkenyl, alkynyl, alkoxy, benzyl, sulfydryl, thioether group, aryl, heteroaryl, amino, amide, imide, cyano, aldehyde group, carbonyl, carboxyl, sulfonic acid group, or ester group. Also provided is a method for preparing high-purity taurine, which adds the catalyst in an ammonolysis step for preparing taurine, thereby having effects of high yield, inhibition of impurity production and a reduced amount of ammonia used, etc. The catalyst has advantages of low cost, stable physical properties, and easy separation from the product. The preparation method is simple to operate with easily available raw materials and high yield, and can be employed for industrial production. Moreover, the purity of the prepared taurine can be up to 98% or higher.

##STR00001##

A hydroprocessing catalyst composition that comprises a chelant treated metal containing support material having incorporated therein a polar additive. The catalyst composition is prepared by incorporating at least one metal component into a support material followed by treating the metal incorporated support with a chelating agent and thereafter incorporating a polar additive into the chelant treated composition.

Disclosed is a method for preparing polylactone by ring opening, belonging to the technical fields of organic catalysis and polymer materials. The invention proposes a new catalytic mechanism, wherein an organic alcohol is used as an initiator to initiate ring opening polymerization of a cyclic monomer under the catalysis of an organic catalyst to obtain a polylactone; and the catalyst is a pyridinium salt. The present invention has the advantages of non-toxic reaction, simple conditions and controllable process; further, the invention can obtain a narrow molecular weight distribution in the absence of solution polymerization, and can effectively inhibit the occurrence of the transesterification compared with the catalysis of 4-(N,N-dimethylamino)pyridine.

Disclosed are N-heterocyclic carbene (NHC) and 4-pyridinol-derived pincer ligands and metal complexes containing these ligands. These compounds can be used to photocatalyticaly reduce CO.sub.2 to CO.

The objective of the present invention is to provide a production method for a 4,5-dihydroisoxazole represented by formula (3), which is safe, industrially desirable, economical, and environmentally friendly.

##STR00001##

The present invention causes the compound of formula (1) to react with hydroxylamine in the presence of an acid catalyst to produce the compound of formula (3) through the reaction represented by the reaction equation.

##STR00002##

The present application describes a sensor apparatus based on chemically functionalized graphene as the sensing materials. The sensing materials is modified from graphene oxide with unique chemical process to form a group of graphene derivatives, e.g. butylamine, hexylamine, decylamine, dodecylamine, benzylamine etc., to detect volatile and non-volatile compounds, e.g. toluene, ethylacetate, ethanol, acetone, hexane etc. with high sensitivity. Pattern recognition algorithms and methods, e.g. PCA, are coupled with the sensors for detecting and quantifying specific chemical compounds. Methods of using the sensor apparatus in applications such as diagnosis of disease and food quality control are disclosed.

The present invention relates to a catalyst containing an active cobalt phase, deposited on a support comprising alumina, silica or silica-alumina, said support containing a mixed oxide phase containing cobalt and/or nickel, said catalyst has been prepared by introducing at least one ether organic compound comprising not more than two ether functions and not comprising a hydroxyl group. The invention also relates to the process for the preparation thereof, and to the use thereof in the field of Fischer-Tropsch synthesis processes.

Provided are an electron donor that is easy to handle and can be used to carry out a coupling reaction economically and efficiently through simple operations under mild conditions in a short period of time, and a method for synthesizing 4,4′-bipyridine using the electron donor. The electron donor includes a mixture of a dispersion product obtained by dispersing sodium in a dispersion solvent and 1,3-dimethyl-2-imidazolidinone, and this electron donor is used in the method for synthesizing 4,4′-bipyridine.

The present invention relates to a liquid crystal alignment agent composition comprising degradable liquid crystal alignment polymer; and a catalyst precursor compound of a specific structure, a method for preparing a liquid crystal alignment film using the same, and a liquid crystal alignment film and a liquid crystal display using the same.