NOVELTY - Catalytic nanowires comprise mixture of four different doping elements chosen from metal element, semi-metal element and non-metal element.    USE - Catalytic nanowires are used for preparation of catalytic material for preparation of ethane and/or ethylene (all claimed) and oxidative coupling of methane to 2C hydrocarbon.    ADVANTAGE - The catalytic material is efficiently prepared by the catalytic nanowires, by a simple process.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) catalytic material, which comprises catalytic nanowires with diluent or support containing alkaline-earth metal compound;    (2) preparation of catalytic material, which involves mixing catalytic nanowires with binder, and removing the binder;    (3) purification of phage solution, which involves filtering phage solution through membrane comprising pores of 0.1-3 mu m, obtaining microfiltration retentate and microfiltration permeate, filtering the microfiltration permeate through membrane comprising pores of 1-1000 kDa and recovering ultrafiltration retentate comprising purified phage solution;    (4) preparation of catalytic nanowires, which involves providing solution comprising templates, introducing metal ion and anion to the prepared solution, performing nucleation, growing nanowires comprising metal salts of formula: MmXnZp on the template and converting the nanowires to metal oxide nanowires comprising metal oxides of formula: MxOy, metal oxy-hydroxide of formula: MxOyOHz, metal oxycarbonate of formula: MxOy(CO3)z and/or metal carbonates of formula: Mx(CO3)y;    (5) preparation of metal oxide, metal oxy-hydroxide, metal oxycarbonate or metal carbonate catalytic nanowires in core-shell structure, which involves providing solution containing templates, introducing metal ion (Z1) and anion (A1) to the solution, performing nucleation, growing nanowires (A) of formula: M1m1X1n1Zp1 on the template, introducing a metal ion (Z2) and anion (A2) to the solution, performing nucleation, growing nanowires (B) of formula: M2m2X2n2Zp2 on the surface of the nanowires (A), converting the nanowires (A) and nanowires (B) to the metal oxide nanowires of formula: M1x1Oy1 and M2x2Oy2, metal oxy-hydroxide nanowires of formula: M1x1Oy1OHz1 and M2x2Oy2OHz2, metal oxycarbonate nanowires of formula: M1x1Oy1(CO3)z1 and M2x2Oy2(CO3)z2 or metal carbonate nanowires of formula: M1x1(CO3)y1 and M2x2(CO3)y2; and    (6) preparation of ethane and/or ethylene, which involves converting methane to ethane and/or ethylene or in presence of catalytic material.    M=groups 1-7 metal element, lanthanide or actinide;    M1,M2=metal element;    X,X1,X2=hydroxide, carbonate, bicarbonate, phosphate, hydrogen phosphate, dihydrogenphosphate, sulfate, nitrate or oxalate;    Z=O;    n,m,x,y,n1,m1,x1,y1,n2,m2,x2,y2,z2,z1=1-100;and    p,p1,p2=0-100.