Disclosed is a gas sensing material for methylbenzene detection. Specifically, the gas sensing material includes a nanocomposite of Cr.sub.2O.sub.3 and ZnCr.sub.2O.sub.4. The content of Cr in the nanocomposite is from 67.0 at. % to 90.0 at. %, based on the sum of the contents of Cr and Zn atoms. The gas sensing material is highly selective to methylbenzenes over other gases and is highly sensitive to methylbenzenes. Also disclosed are methods for preparing the gas sensing material. The methods facilitate control over the composition of the gas sensing material and enable rapid synthesis of the gas sensing material at low temperature. Also disclosed is a gas sensor including the gas sensing material.

The invention relates to a method for preparing a composite metal oxide hollow fibre. A certain stoichiometry of composite metal oxide raw material and a polymer binding agent are added to an organic solvent, and mixed mechanically to obtain an evenly dispersed spinning solution having a suitable viscosity. After defoaming treatment, the spinning solution is extruded through a spinneret and, after undergoing a certain dry spinning process, enters an external coagulation bath; during this period, a phase inversion process occurs and composite metal oxide hollow fibre blanks are formed. The blanks are immersed in the external coagulation bath and the organic solvent is displaced; after natural drying, the blanks undergo a heat treatment process; during this period, polymer burn off, in situ reaction, and in situ sintering processes occur to obtain the composite metal oxide hollow fibre.

An abrasive particle having a body including a first major surface, a second major surface opposite the first major surface, and a side surface extending between the first major surface and the second major surface, such that a majority of the side surface comprises a plurality of microridges.

An abrasive particle having a body including a first major surface, a second major surface opposite the first major surface, and a side surface extending between the first major surface and the second major surface, such that a majority of the side surface comprises a plurality of microridges.

A refractory object may include a Cr.sub.2O.sub.3 content of at least about 80 wt. % of a total weight of the refractory object, an Al.sub.2O.sub.3 content of at least about 0.7 wt. % and not greater than about 10.0 wt. % of the total weight of the refractory object, a SiO.sub.2 content of at least about 0.3 wt. % and not greater than about 5.0 wt. % of the total weight of the refractory object and a TiO.sub.2 content of at least about 1.0 wt. % and not greater than about 5.6 wt. % TiO.sub.2 of the total weight of the refractory object. The refractory object may further include an MOR of at least about 37 MPa as measured at 1200 C.

A refractory object may include a Cr.sub.2O.sub.3 content of at least about 80 wt. % of a total weight of the refractory object, an Al.sub.2O.sub.3 content of at least about 0.7 wt. % and not greater than about 10.0 wt. % of the total weight of the refractory object, a SiO.sub.2 content of at least about 0.3 wt. % and not greater than about 5.0 wt. % of the total weight of the refractory object and a TiO.sub.2 content of at least about 1.0 wt. % and not greater than about 5.6 wt. % TiO.sub.2 of the total weight of the refractory object. The refractory object may further include an MOR of at least about 37 MPa as measured at 1200 C.

There is provided a refractory article for use in metal casting and a composition for manufacture thereof, comprising a particulate refractory material, an oxidisable fuel, an oxidant, a sensitizer; a binder, and from 0.5 to 5 wt % CaSO.sub.4.

An electrically conductive member of the present disclosure includes a base member containing chromium (Cr), and a first layer provided on a surface of the base member and containing chromium(III) oxide (Cr.sub.2O.sub.3). The first layer also contains titanium (Ti).

An electrically conductive member of the present disclosure includes a base member containing chromium (Cr), and a first layer provided on a surface of the base member and containing chromium(III) oxide (Cr.sub.2O.sub.3). The first layer also contains titanium (Ti).

A proton conducting ceramic membrane comprising a conducting layer, wherein said conducting layer comprises a mixture of a rare-earth tungstate as herein defined and a mixed metal oxide as herein defined. The invention also relates to a reactor comprising said membrane and the use of said membrane in a dehydrogenation process.